Ali's dog weighs 8 times as much as her cat. together, the two pets weigh 54 pounds. how much does ali's dog weigh?

Let's call the cat "c"

then the dog will simply be 8c in terms of weight .

and c+8c=54, since both weight 54 together

so 9c=54,

and c=5 (dividing both by 6)

and the dog was 8*c=8*6=48

so the dog weights 47 pounds!